Movement for bicycles.



No. 636,624. Patented Nov. 7, I899. H. W. E. BBAUER &. M. JASPERSEN.

MOVEMENT FOR BICYCLES.

(Application filed. my 18, 18983 UNITED STATES- PATENT OFFICE.

HEINRICH W. E. BRAUER AND MAX JASPERSEN, OF HAMBURG, GERMANY.

MQVEMENT FOR BICYCLES.

SPECIFICATION forming part of Letters Patent No. 636,624, dated November7, 1899.

Application filed May 18, 1898.

JASPERSEN, merchant, subjects of the Em-- peror of Germany, residing atHamburg, in the Empire of Germany, have invented certain new and usefulImprovements in Move- ,ments for Bicycles, consisting of a leverageconstructed with a movably-oonnected bent lever and a lever which workson a disk on the bottom bracket-spindle; and we do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the'same.

Right apd left of the bottom bracket-spindle are placed disks A, turnedsmooth on their circumference, which take the place of the cranks andare fixed to the spindle C. These disks have each of them a single ordouble hub D, on which a lever-arm B turns, which can be lengtheneddownward. The head of the lever-arm B turns on the pin F. Around thispin F also a bent lever B and E turns, of which the one arm B isconnected with the pedals, while the other arm E has a circular orcurviform piece which locks in a clip,

E, situated on the circumference of the disk and capable of movingaround it. When the lever end B is moved,then the clip E is pressed uponthe disk A, so that this. and the wheel along with it are set in motion.To minimize the dead-point, a cross-piece G is arranged on the lever-armB, with an adjusting-screw H. It is possible by screwing in the screw Hmore or less to regulate the amplitude of the leverarm B. On thelever-arm B there is a spring L, which by means of the cross-piece G isput in connection with the lever-arm B. The spring L is fixed at one endto the lever-arm B and bears outward at the other end upon the lever Bthrough the medium of the crosspiece G, and by the action of the shortarm E of the elbow-lever B E tends to force the friction-clip Econstantly in contact with the beveled periphery of the disk A, so as tolock Serial No. 681,029. on model.)

the lever B to the disk A. When the leverarm B is withdrawn, this, onthe other hand, suspends the spring-power and draws the clip E 05 thedisk, so that the wheel can revolve farther. On the other hand, it ispossible by means of the adjusting-screw H, situated on the cross-pieceGr on the lever-arm B, to change the movement into a crank-movement.This is efiected as follows: The screw H is screwed down, so that thelever B presses the clip E tightly on the disk A, and thereby changesthe otherwise-movable lever into a fixed crank.

The sides of the disk A can be also beveled at a. This entails theadvantage of a very large adhesion-surface, so that it is possible touse the smallest parts conceivable with the least weight-a point ofspecial importance in bicycles.

S is a case which environs the disk with its parts.

We claim-- The combination of the shaft 0, the beveledged disk A keyedthereon, the lever B formed with two parallel arms, journaled on the hubof the disk A, the segment-formed friction-clip E embracing the edge ofthe disk A, the elbow-lever B E, fulcrumed between the lever-arms B, Bhaving a long arm B to which power is applied and a short arm E engagingin a cavity in the back of the frictionclip E the spring L acting uponthe elbowlever B E to press the frictionclip into engagement with thedisk, and the set-screw H mounted in a cross-piece G on the lever B, B,and bearing on the lever-arm B to regulate and control the angularmovement of the elbow-lever B E relatively to the lever B, B as shownand described.

In testimony whereof we afilx our signatures in presence of twowitnesses.

H. W. EBBAUER. MAX JASPERSEN. Witnesses:

WALDEMAR F. LEONHARD, E. H. L. MUMMENHOFF.

